import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

@WebServlet("/login")
public class Login extends HttpServlet {
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        //1.获取到用户名和密码
        String username = req.getParameter("username");
        String password = req.getParameter("password");
        if(username == null || password == null || username.equals("") || password.equals("")){
            return;
        }

        //2.验证用户名和密码是否正确
        if(!username.equals("zzq")){
            resp.setContentType("text/html;charset=utf8");
            resp.getWriter().write("错误");
            return;
        }

        if(!password.equals("123")){
            resp.getWriter().write("错误");
            return;
        }

        //3.登陆成功，此时就可以给这个用户创建会话。
        HttpSession session = req.getSession(true);
        session.setAttribute("username", username);
        session.setAttribute("time", System.currentTimeMillis());

        //4.让页面自动跳转到别的地方
        resp.sendRedirect("MessageWall.html");
    }
}
